Neon, excited state

The excited-state neon atom is denoted with an asterisk, as Ne. ... 

In fact, this mechanism has been confirmed by a calculation of the cross sections for impact ionization and impact excitation in electron-ion collisions [36]. The latter was found to be exceptionally low for neon. The basic features of recollision excitation follow from an amplitude such as (4.1) with, however, integration over one additional time the first electron tunnels out at the time t", recollides, promotes the bound electron into an excited state with energy Eq2 > E02, and leaves the interaction region at the time t > t", while the bound electron only becomes free at the later time t > t. Figure 4.5 exhibits the results of such a model. Indeed, for a sufficiently high-lying excited state, the region around zero ion momentum is filled in. 

The cell is also admirably suited to free radical studies in the liquid phase at low temperatures. Flash photolysis or steady-state photolysis may be used, depending upon the chemical lifetime of the free radical. Pulsed or steady-state x-ray excitation may prove advantageous here, since penetration of the radiation into the solution is required. In these heavy-atom solvents much of the energy can be absorbed by the solvent and gently transferred to the solute. Experiments using liquid neon, hydrogen, or even liquid helimn as solvents may be possible when pulsed electron beams are used. Solutes in these cases may be atomic hydrogen, excited states of helium atoms or molecules, and possibly ionic species. 

Another study for the neon atom indicates that convergence of the MP series requires that the energy spectrum is well-separated (i.e. the HF reference is significantly below the first excited state), not only for the unperturbed (H = Hq) and fully perturbed (H-Ho + H0 systems, but also for the negative perturbed case (H = Hq—H ). This condition was found not to hold when a basis set containing diffuse functions was used. 

Since the second laser ionizes the excited atom in DLI, this step may be accomplished by an off-resonant photon (see Fig. 1). If a nitrogen laser-pumped dye laser provides the resonant photon, a fraction of the nitrogen laser beam can conveniently ionize the atom from the laser-excited state 14,15). It is theoretically possible to photoionize every atom in the periodic table except helium and neon using five RIS ionization schemes involving stepwise and/or multiphoton excitation4). Presumably these... 

Y. Komninos, Th. Mercouris, G.A. Nicolaides, Regular series of doubly excited states inside two-electron continua Application to 2s -hole states in Neon above the Ne " ls 2s 2p and ls 2s2p thresholds, Phys. Rev. A 83 (2011) 022501. 

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